Montana DOR Publishes 2026 Interest Rates on Tax Liabilities

The Montana Department of Revenue (DOR) published guidance detailing 2026 interest rates applicable to unpaid taxes and underpayments. The annual interest rate for 2026 is 7 percent for individual income tax, estate and trust, and pass-through entity taxes, as well as underpaid estimated taxes, computed daily at 0.019178 percent. The interest rate for all other taxes is 10.25 percent, computed daily at 0.028082 percent. Interest accrues daily beginning on the original due date of the return. [Mont. Dep’t of Revenue, Interest and Penalties, 04/01/26]

This story was produced by Bloomberg Tax Automation, and edited by Bloomberg Tax staff.